The Nervous System And Brain Organization. Central Nervous System Consists of the brain and spinal cord The brain is the central “computer” of the nervous.

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Presentation on theme: "The Nervous System And Brain Organization. Central Nervous System Consists of the brain and spinal cord The brain is the central “computer” of the nervous."— Presentation transcript:

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The Nervous System And Brain Organization

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Central Nervous System Consists of the brain and spinal cord The brain is the central “computer” of the nervous system The spinal cord is the “cable” that is used to communicate to the rest of the body

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Peripheral Nervous System All the parts of the nervous system outside of the brain and spinal cord Two major divisions –Somatic system – the muscles and sense organs (voluntary behavior) –Autonomic system – the internal organs and glands (involuntary behavior)

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Autonomic Nervous System Two divisions –Sympathetic branch – arouses the body Prepares the body for fight or flight –Parasympathetic branch – quiets the body or brings it back to normal

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Nervous System Central Nervous System Peripheral Nervous System BrainSpinal Cord Autonomic System Somatic System Sympathetic System Parasympathetic System

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Brain Organization Cerebrum – two large hemispheres that cover the upper part of the brain Cerebral cortex – the outer layer of the cerebrum –made up of wrinkled gray matter that contains nerve cell bodies

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Brain Organization cont’d… Cerebral hemispheres – right and left halves of the cerebrum Corpus callosum – bundle of fibers connecting the hemispheres –Cut in a ‘split-brain’ operation Spatial neglect – when a person pays no attention to the left side of visual space after damage to the right hemisphere

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The Midbrain Small region, located above spinal cord, but below the forebrain Coordinates simple muscle movements with sensory information Reticular formation – network of fibers and cell bodies throughout the hindbrain – associated with attention, alertness and some reflexes

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The Forebrain Contains the thalamus and hypothalamus Thalamus – located on top of brain stem – relays sensory information to the cerebral cortex Hypothalamus – controls metabolic functions including body temp, libido, hunger, thirst, and the endocrine system

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The Limbic System Contains hypothalamus, parts of the thalamus, amygdala, and hippocampus Large role in producing emotion and motivated behavior Amygdala – associated with fear responses Hippocampus – associated with storing memories (lies in the temporal lobe)